What is the term for a regularly repeated line in a poem or song?

The term for a regularly repeated line in a poem or song is a refrain. A refrain typically underscores the central theme or emotional core of a piece, creating a rhythm and enhancing the musical quality of the work. It often appears at regular intervals throughout the poem or song, providing a sense of unity and reinforcing the message or feeling conveyed. This repetition allows the audience to anticipate and connect with the lines, making the work more memorable and impactful.

Other terms in the choices refer to different literary concepts. Parallel structure involves the use of similar grammatical forms, often enhancing clarity and rhythm in writing. Diction refers to the choice of words and style of expression used by the writer, which affects tone and meaning. An unreliable narrator is a character in a story whose credibility is compromised, adding complexity to the narrative. Each of these terms highlights distinct aspects of literature that do not relate to the specific concept of repetition found in a refrain.